CN216241221U

CN216241221U - Double-acting pump

Info

Publication number: CN216241221U
Application number: CN202122875365.7U
Authority: CN
Inventors: 崔建斌; 徐正明; 李晋波
Original assignee: Shanxi Yicheng Petroleum Equipment Co ltd
Current assignee: Shanxi Yicheng Petroleum Equipment Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-04-08
Anticipated expiration: 2031-11-23

Abstract

The utility model discloses a double-acting pump, which comprises a working barrel assembly and a plunger assembly, wherein the working barrel assembly comprises an oil pipe coupling, a central pipe plug, a power pump barrel, an outer pipe, a limiting joint, a plunger rod sealing sleeve, a discharge and production pump barrel, a lower outer pipe and a fixed valve, and the plunger assembly comprises a power plunger, a plunger rod, a discharge and production plunger and a traveling valve.

Description

Double-acting pump

Technical Field

The utility model belongs to the technical field of mining, and particularly relates to a double-acting pump.

Background

In the prior art, a coal bed gas drainage and gas recovery process mainly adopts a tubular pump, and when the discharge capacity requirement of a coal bed is high and the sand concentration in a medium is high, the conventional underground pump set cannot meet the requirement.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

To this end, embodiments of the present invention provide a dual action pump that can meet well conditions requiring high displacement and high sand concentration in the medium.

A dual action pump according to an embodiment of the present invention includes a working barrel assembly and a plunger assembly.

The working barrel assembly comprises an oil pipe coupling, a central pipe plug, a power pump barrel, an outer pipe, a limiting joint, a plunger rod sealing sleeve, an extraction pump barrel, a lower outer pipe and a fixed valve, the oil pipe coupling is located at the top end of the working barrel assembly, the lower end of the oil pipe coupling is connected with the outer pipe, the lower end of the outer pipe is connected with the limiting joint, the limiting joint is provided with an inner hole, the plunger rod sealing sleeve is connected with the inner hole, part of the plunger rod sealing sleeve extends out of the lower end of the inner hole, the extraction pump barrel is connected with the limiting joint, the limiting joint part extends into the extraction pump barrel, the extraction pump barrel and the outer pipe are arranged at intervals, a breathing hole A is formed in the extraction pump barrel, the lower outer pipe is connected with the lower end of the extraction pump barrel, and the fixed valve is arranged in the lower outer pipe and connected with the lower outer pipe;

the plunger assembly, the plunger assembly includes power plunger, plunger rod, row adopts plunger, traveling valve, the power plunger is located in the power pump section of thick bamboo, and with power pump section of thick bamboo clearance fit, the upper end of plunger rod with the power plunger is connected, the plunger rod with plunger rod seal cover clearance fit, arrange adopt the plunger with the lower extreme of plunger rod is connected, and with arrange and adopt pump section of thick bamboo clearance fit, traveling valve establishes arrange and adopt the lower tip of plunger. And the plunger rod is provided with a liquid discharge hole B.

In some embodiments, the power plunger is further provided with a grease groove.

In some embodiments, the double action pump is further provided with a first wiper, the power plunger having a slot in an upper end thereof, the first wiper being disposed within the slot.

In some embodiments, the double-acting pump is further provided with a second dust ring, and the second dust ring is connected with the inner hole of the limiting joint and partially extends out of the upper end of the inner hole.

In some embodiments, a well-flushing pipe, a well-flushing screen pipe and a well-flushing pipe are further provided, the well-flushing pipe is arranged on the drainage plunger, the well-flushing pipe is positioned in the plunger rod, the lower end of the well-flushing pipe is connected with the well-flushing pipe, the well-flushing screen pipe is arranged in the power plunger and is connected with the power plunger, and the upper end of the well-flushing pipe penetrates through the power plunger and partially extends into the well-flushing screen pipe.

In some embodiments, the dual action pump is further provided with a breather screen sleeved over the plunger pump barrel, and the breather screen covers the breather holes B.

Has the advantages that:

1. the double-acting pump can meet the requirements of well conditions of large discharge capacity and high sand concentration in a medium.

2. The plunger assembly has liquid discharge both in the upward direction and in the downward direction, so that the double-acting function of the pump set is realized, and the discharge capacity is large.

3. The screen pipe can realize the filtration of well fluid.

4. The dust ring can prevent sand grains in the medium from entering the fit clearance.

5. The well washing, well washing pipe and well washing screen pipe can realize full-channel well washing.

Drawings

FIG. 1 is a schematic view of a dual action pump according to an embodiment of the present invention;

FIG. 2 is a fragmentary view of a double acting pump working cylinder assembly of an embodiment of the present invention;

FIG. 3 is a partial view of a double acting pump working cylinder assembly of an embodiment of the present invention;

FIG. 4 is a partial view of a dual action pump working cartridge assembly of an embodiment of the present invention

FIG. 5 is a partial view of a dual action pump plunger assembly of an embodiment of the present invention

FIG. 6 is a lower partial view of a dual action pump plunger assembly according to an embodiment of the present invention.

Reference numerals:

an oil pipe coupling 1; a central pipe plug 2; a power pump cylinder 3; an outer tube 4; a limit joint 5; a plunger rod sealing sleeve 6; a discharge and production pump cylinder 7; a breather screen 8; a lower outer tube 9; a fixed valve 10; a power plunger 11; a well-flushing screen 12; washing the well pipe 13; a plunger rod 14; a discharging and mining plunger 15; a traveling valve 16; a first dust ring 17; a second dust ring 18; a grease groove 19; the well bore 20 is washed.

Detailed Description

The following detailed description of embodiments of the utility model refers to the accompanying drawings.

Referring to fig. 1, a double action pump of an embodiment of the present invention includes a working barrel assembly and a plunger assembly.

Specifically, as shown in fig. 2-4, the working barrel assembly includes a tubing coupling 1, a central tube plug 2, a power pump barrel 3, an outer tube 4, a limit joint 5, a plunger rod sealing sleeve 6, a drainage and production pump barrel 7, a breathing hole sieve tube 8, a lower outer tube 9 and a fixed valve 10, the tubing coupling 1 is in threaded connection with the outer tube 4, the lower end of the outer tube 4 is in threaded connection and sealing with the limit joint 5, a second dust ring 18 is installed at the upper end of an inner hole of the limit joint 5, the lower end of the inner hole of the limit joint 5 is in threaded connection and sealing with the plunger rod sealing sleeve 6, and the lower end of the limit joint 5 is in threaded connection with the drainage and production pump barrel 7. The discharge and mining pump cylinder 7 is provided with a breathing hole B, a breathing hole sieve tube 8 is sleeved on the discharge and mining pump cylinder 7, and the breathing hole sieve tube 8 covers the breathing hole B. The lower end of the discharging and extracting pump cylinder 7 is in threaded connection with the lower outer pipe 9 and is sealed. The fixed valve 10 is arranged in the lower outer pipe, and is in threaded connection and sealed with the lower outer pipe.

As shown in fig. 5 and 6, the plunger assembly comprises a power plunger 11, a plunger rod 14, a discharging and collecting plunger 15 and a traveling valve 16. The upper end of the power plunger 11 is provided with a groove, and the first dustproof ring 17 is arranged in the groove. The outer wall of the power plunger 11 is also provided with a lubricating grease groove 19. A well-flushing sieve tube 12 is arranged in the power plunger 11, and the well-flushing sieve tube 12 is fixedly connected and sealed with the power plunger 11 through threads. The power plunger 11 is in threaded connection with a plunger rod 14, the plunger rod 14 is a hollow rod, and a liquid discharge hole A is formed in the plunger rod 14. The plunger rod 14 is connected and sealed with the discharging and producing plunger 15 in a threaded mode, and a well washing hole 20 is formed in the discharging and producing plunger 15. The well washing pipe 13 is arranged in the plunger rod 13, the lower end of the well washing pipe 13 is connected and sealed with a well washing hole 20 of the drainage plunger 15, and the lower end of the drainage plunger 15 is provided with a traveling valve 16. The power plunger 11 is in clearance fit with the power pump barrel 3 to form sealing, the plunger rod 14 is in clearance fit with the plunger rod sealing sleeve 6 to form sealing, and the drainage and mining plunger 15 is in clearance fit with the drainage and mining pump barrel 7 to form sealing.

According to the double-acting pump of the embodiment of the utility model, high-pressure water at the lower ground level is injected through the central pipe plug 2, the extraction plunger 15 is matched with the extraction pump barrel 7 at the time, the well washing hole 20 is sealed, the plunger assembly descends under the pushing of the high-pressure water, the traveling valve 16 is opened, the fixed valve 10 is closed, liquid in the extraction pump barrel 7 enters the power pump barrel 3 through the annular space of the traveling valve 16, the plunger rod 14 and the washing well pipe 13 through the liquid discharge hole A, is mixed with the liquid in the power pump barrel 3 and then is discharged through the annular channel between the power pump barrel 3 and the outer pipe 4, and at the time, well liquid can also enter the cavity above the extraction pump barrel 7 through the breathing hole screen pipe 8 after being filtered.

When descending, the water injection amount is the product of the section area of the power pump cylinder 3 and the stroke of the plunger assembly, the water discharge amount is the product of the section area of the drainage pump cylinder 7 and the stroke and the product of the section area of the annular space between the power pump cylinder 3 and the plunger rod 14 and the stroke, and the water discharge amount is larger than the water injection amount, so that liquid is discharged when descending.

When the power plunger 11 descends to the limiting joint 5, the well washing hole 20 enters the lower outer pipe 9, the sealing performance of the well washing hole 20 is lost, and injected power liquid enters a chamber below the discharging and extracting plunger 15 through the well washing sieve pipe 8, the well washing pipe 13 and the lower outer pipe 9, is mixed with liquid in the chamber, and then is discharged through the traveling valve 16, the plunger rod 14, the liquid discharge hole A and an annular passage between the power pump barrel 3 and the outer pipe 4. The full-channel well washing function is realized.

When the well fluid moves upwards, high-pressure water is injected from an annular channel between the central pipe joint 1 and the pipe coupling 1, the traveling valve 16 is closed, the high-pressure water acts on the lower end face of the power plunger 11 to push the plunger assembly to move upwards, the fixed valve 10 is opened, and the well fluid is sucked into a cavity below the extraction plunger 15 due to pressure difference. The liquid in the cavity above the discharge pump cylinder 7 is discharged through the breathing hole B.

The water injection quantity during ascending is the product of the section area of the annular space between the power pump cylinder 3 and the plunger rod 14, the discharge quantity is the product of the section area of the power pump cylinder 7 and the plunger stroke, and the discharge quantity is larger than the water injection quantity, so that liquid is discharged during ascending.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model and it is intended to cover in the claims the utility model as defined in the appended claims.

In the description of the present invention, it is to be understood that the terms "left", "right", "front", "rear", "upper", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.

Claims

1. A dual action pump, comprising:

the working barrel assembly comprises an oil pipe coupling, a central pipe plug, a power pump barrel, an outer pipe, a limiting joint, a plunger rod sealing sleeve, a drainage pump barrel, a lower outer pipe and a fixed valve, the tubing coupling is positioned at the top end of the working barrel assembly, the lower end of the tubing coupling is connected with the outer tube, the lower end of the outer tube is connected with the limiting joint, the limiting joint is provided with an inner hole, the sealing sleeve of the plunger rod is connected with the inner hole, and part of the oil extraction pump cylinder extends out of the lower end of the inner hole, the oil extraction pump cylinder is connected with the limit connector, the limit connector part extends into the oil extraction pump cylinder, the discharging and mining pump cylinder and the outer pipe are arranged at intervals, a breathing hole A is formed in the discharging and mining pump cylinder, the lower outer pipe is connected with the lower end of the discharging and mining pump cylinder, and the fixed valve is arranged in the lower outer pipe and connected with the lower outer pipe;

the plunger assembly comprises a power plunger, a plunger rod, a discharge plunger and a traveling valve, wherein the power plunger is positioned in the power pump barrel and is in clearance fit with the power pump barrel, the upper end of the plunger rod is connected with the power plunger, the plunger rod is in clearance fit with a sealing sleeve of the plunger rod, the discharge plunger is connected with the lower end of the plunger rod and is in clearance fit with the discharge plunger barrel, the traveling valve is arranged at the lower end of the discharge plunger, and the plunger rod is provided with a liquid discharge hole B.

2. A double action pump as claimed in claim 1, wherein said power plunger is further provided with a grease groove.

3. A double action pump as in claim 1, further comprising a first wiper, said power plunger having a slot in an upper end thereof, said first wiper being disposed in said slot.

4. A double acting pump as claimed in claim 1, wherein a second wiper is provided, said second wiper being connected to the inner bore of said spacing joint and extending partially beyond the upper end of said inner bore.

5. A double action pump as claimed in claim 1, further comprising a well wash bore disposed on said production plunger, a well wash pipe disposed within said plunger rod, a lower end of said well wash pipe connected to said well wash bore, and a well wash screen disposed within said power plunger and connected to said power plunger, an upper end of said well wash pipe passing through said power plunger and partially extending into said well wash screen.

6. A double acting pump as claimed in claim 1, further comprising a breather screen sleeved over said drainage pump barrel, said breather screen covering said breather ports.